You need to plow a path to your work area and move the insulation. Then you will have a path for when you need to put it back....no other way but to get in there.
Get a tyvek suit...$20 and a respirator $20 more. and maybe some goggles

but what do i do about there not being a vapor barrier? when i pull down the drywall on the ceiling to put up new, all of the insulation will fall through the ceiling. how do I avoid this, and should I put a vapor barrier up when i remodel, and how?

After you remove the loose insulation to other areas in the attic, remove the ceiling and install some faced fiberglass batt, stapling the flanges to the edge of the ceiling joists. Then you will have a new vapor retarder and insulation. Use the first layer as high as the joists, second perpendicular layer as per R-value for your locale.

That is only if you have to remove the ceiling. Only in very cold climates, do you need a vapor barrier in the attic. A special vapor retarder paint primer will also meet the requirements (0.5 perms) to keep the moisture from going to your insulation over the bathroom.